Innovative laboratory unit for pre-testing of oxygen carriers for chemical-looping combustion

• Published in: Biomass conversion and biorefinery Vol. 13; no. 6; pp. 5095 - 5106
• Main Authors: Fleiß, B., Fuchs, J., Penthor, S., Arlt, S., Pachler, R., Müller, S., Hofbauer, H.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2023; Springer Nature B.V
• Subjects: Abrasion; Biotechnology; Carbon dioxide; Energy; Fluidized bed combustion; Fluidized beds; Gaseous fuels; Laboratories; Metal oxides; Original Article; Oxidation; Oxygen; Reaction mechanisms; Renewable and Green Energy; Sampling; Separation; Solid fuels; Oxygen carrier; Solid sampling; Chemical-looping combustion; CLC; OC; Pre-testing
• ISSN: 2190-6815; 2190-6823
• DOI: 10.1007/s13399-021-01530-w

Chemical-looping combustion (CLC) is a highly efficient CO 2 separation technology with no direct contact between combustion air and fuel. A metal oxide is used as an oxygen carrier (OC) and acts in a dual fluidized bed as a separation tool and supplies the fuel with oxygen, which as an oxidation medium causes combustion to CO 2 and H 2 O. The use of solid fuels, especially biomass, is the focus of current investigations. The OC plays a key role, because it must meet special requirements for solid fuels, which are different to gaseous fuels. The ash content, special reaction mechanisms, and increased abrasion make research into new types of OC essential. Preliminary testing of OC before their use in larger plants regarding their suitability is recommended. For this reason, this work shows the design and the results of a laboratory reactor, which was planned and built for fundamental investigation of OC. Designed as a transient fluidized bed, the reactor, equipped with its own fuel conveying system and an in situ solid sampling, is intended to be particularly suitable for cheap and rapid pre-testing of OC materials. During the tests, it was shown that the sampling device enables non-selective sampling. Different OC were tested under various operating conditions, and their ability to convert different fuels could be quantified. The results indicate that OC can be sufficiently investigated to recommend operation in larger plants.